Coding Dojo: Data Munging (2016)
26
Coding Dojo: Data Munging (without control structures) Peter Kofler, ‘Code Cop’ @codecopkofler www.code-cop.org Copyright Peter Kofler, licensed under CC-BY.
-
Upload
peter-kofler -
Category
Technology
-
view
180 -
download
0
Transcript of Coding Dojo: Data Munging (2016)
Coding Dojo:Data Munging
(without control structures)
Peter Kofler, ‘Code Cop’@codecopkofler
www.code-cop.org
Copyright Peter Kofler, licensed under CC-BY.
Peter Kofler
• Ph.D. (Appl. Math.)
• Professional SoftwareDeveloper for 15+ years
• “fanatic about code quality”
• Freelance Code Mentor
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
I help development teams with
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
● Professionalism
● Quality and Productivity
● Continuous Improvement
Mentoring
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
● Pair Programming
● ProgrammingWorkshops
● DeliberatePractice, e.g. Coding Dojos
Developing Quality Software Developers
Dojo Structure
● Introduction 15'● Coding 60'● Retrospective 15'● Break 15'● Coding 60'● Retrospective 15'
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Coding Dojo Mindset
● Safe place outsidework
● We are here to learn● Need to slow down● Focus on doing it right● Collaborative Game
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Coding Dojo Rules
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Pair Programming & TDD
● regular Pair Programming● do not talk for too long● do not interrupt the other● no “keyboard hugging“
● use TDD (or at least “sort of” TDD)● write a test before you write code● refactor mercilessly● no debugger
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Constraints
● Challenges during a dojo or coderetreat
● Moving to the extreme is a way of learning
● Examples● Missing Tool (No Mouse, …)● Missing Feature (No IFs, …)
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Constraint: Complexity One
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Cyclomatic Complexity One
● No conditional statements (if, switch, ?:)● No loops (for, while, loop, etc.)● Technically no control structures.
● Use Optional or Maybe type.● Use higher order functions like map, filter and reduce instead.
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Assignment Part 1
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Weather “Data Munging“
● weather.dat contains daily weather data for a month.
● Find the day number (column one)● with the smallest temperature spread.
(Max temperature is second column,min temperature is third column.)
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Prepare
● Find a pair.● Choose a programming language.● Set up the environment.
● Create new project.● Add testing framework.
● Check part1/requirements.txt.● Implement Data Munging.
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Don't Focus on Getting it Done.F0cus on Doing
It Perfectly.
→Practice
Assignment Part 2
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Soccer “Data Munging“
● football.dat contains the results from the English Soccer League.
● The columns 'F' and 'A' contain the total number of goals scored for and against each team.
● Find the name of the team● with the smallest difference in 'for' (F)
and 'against' (A) goals.
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
→Practice
Assignment Part 3
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
DRY Fusion
● Take the two programs written,● factor out as much common code as
possible,● leaving you with two smaller programs● and some kind of shared functionality.
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
→Practice
Closing Circle
● What did you learn today?
● What surprised you today?
● What will you do differently in the future?
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Peter Kofler@codecopkofler
www.code-cop.org
Kata by Dave Thomas
@pragdavehttp://codekata.com/kata/kata04-data-munging/
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
CC Images● Bruce http://www.flickr.com/photos/sherpas428/4350620602/● pairing http://www.flickr.com/photos/dav/94735395/● agenda http://www.flickr.com/photos/24293932@N00/2752221871/● dojo http://www.flickr.com/photos/49715404@N00/3267627038/● rules http://www.flickr.com/photos/phunk/4188827473 x● maze https://www.flickr.com/photos/cyberslayer/952953634● weather https://www.flickr.com/photos/enki22/8255595370/● stadium https://www.flickr.com/photos/113417287@N08/13994724156/● DRY https://www.flickr.com/photos/draconianrain/896834248/● wants you http://www.flickr.com/photos/shutter/105497713/
PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
